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#!/usr/bin/env vpython3
# Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
#
# Use of this source code is governed by a BSD-style license
# that can be found in the LICENSE file in the root of the source
# tree. An additional intellectual property rights grant can be found
# in the file PATENTS. All contributing project authors may
# be found in the AUTHORS file in the root of the source tree.
"""This script helps to invoke gn and ninja
which lie in depot_tools repository."""
import json
import os
import re
import shutil
import subprocess
import sys
import tempfile
def FindSrcDirPath():
"""Returns the abs path to the src/ dir of the project."""
src_dir = os.path.dirname(os.path.abspath(__file__))
while os.path.basename(src_dir) != 'src':
src_dir = os.path.normpath(os.path.join(src_dir, os.pardir))
return src_dir
SRC_DIR = FindSrcDirPath()
sys.path.append(os.path.join(SRC_DIR, 'build'))
import find_depot_tools
def RunGnCommand(args, root_dir=None):
"""Runs `gn` with provided args and return error if any."""
try:
command = [
sys.executable,
os.path.join(find_depot_tools.DEPOT_TOOLS_PATH, 'gn.py')
] + args
subprocess.check_output(command, cwd=root_dir)
except subprocess.CalledProcessError as err:
return err.output
return None
# GN_ERROR_RE matches the summary of an error output by `gn check`.
# Matches "ERROR" and following lines until it sees an empty line or a line
# containing just underscores.
GN_ERROR_RE = re.compile(r'^ERROR .+(?:\n.*[^_\n].*$)+', re.MULTILINE)
def RunGnCheck(root_dir=None):
"""Runs `gn gen --check` with default args to detect mismatches between
#includes and dependencies in the BUILD.gn files, as well as general build
errors.
Returns a list of error summary strings.
"""
out_dir = tempfile.mkdtemp('gn')
try:
error = RunGnCommand(['gen', '--check', out_dir], root_dir)
finally:
shutil.rmtree(out_dir, ignore_errors=True)
return GN_ERROR_RE.findall(error.decode('utf-8')) if error else []
def RunNinjaCommand(args, root_dir=None):
"""Runs ninja quietly. Any failure (e.g. clang not found) is
silently discarded, since this is unlikely an error in submitted CL."""
command = [os.path.join(SRC_DIR, 'third_party', 'ninja', 'ninja')] + args
p = subprocess.Popen(command,
cwd=root_dir,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
out, _ = p.communicate()
return out
def GetClangTidyPath():
"""POC/WIP! Use the one we have, even it doesn't match clang's version."""
tidy = ('third_party/android_toolchain/toolchains/'
'llvm/prebuilt/linux-x86_64/bin/clang-tidy')
return os.path.join(SRC_DIR, tidy)
def GetCompilationDb(root_dir=None):
"""Run ninja compdb tool to get proper flags, defines and include paths."""
# The compdb tool expect a rule.
commands = json.loads(RunNinjaCommand(['-t', 'compdb', 'cxx'], root_dir))
# Turns 'file' field into a key.
return {v['file']: v for v in commands}
def GetCompilationCommand(filepath, gn_args, work_dir):
"""Get the whole command used to compile one cc file.
Typically, clang++ with flags, defines and include paths.
Args:
filepath: path to .cc file.
gen_args: build configuration for gn.
work_dir: build dir.
Returns:
Command as a list, ready to be consumed by subprocess.Popen.
"""
gn_errors = RunGnCommand(['gen'] + gn_args + [work_dir])
if gn_errors:
raise RuntimeError('FYI, cannot complete check due to gn error:\n%s\n'
'Please open a bug.' % gn_errors)
# Needed for single file compilation.
commands = GetCompilationDb(work_dir)
# Path as referenced by ninja.
rel_path = os.path.relpath(os.path.abspath(filepath), work_dir)
# Gather defines, include path and flags (such as -std=c++11).
try:
compilation_entry = commands[rel_path]
except KeyError as not_found:
raise ValueError('%s: Not found in compilation database.\n'
'Please check the path.' % filepath) from not_found
command = compilation_entry['command'].split()
# Remove troublesome flags. May trigger an error otherwise.
if '-MMD' in command:
command.remove('-MMD')
if '-MF' in command:
index = command.index('-MF')
del command[index:index + 2] # Remove filename as well.
return command
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